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Self-crypting script files

roy g biv
29a [7]
February 2003

1
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Abstract

When thinking about the number of encrypted macro viruses, it is strange that there are not so many encrypted script viruses. I have no answer for why it is so. ;) Anyway, here I present a simple engine for encrypting VBScript and JScript files. It uses a variable skip-code encryption with oligomorphic decryptor. The cryptor supports variable spacing, random variable names, random variable case, random keyword case (VBScript only), and variable skip-codes with constant packet size. It can be used recursively, too.

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